| 1. A Trebuchet | Title-page |
| 2. Comb Moss, Derbyshire | 11 |
| 3. Maiden Castle, West Entrance | 16 |
| 4. Maiden Castle, East Entrance | 17 |
| 5. Stockade of Stone and Rubble, with Palisade of Wood | 19 |
| 6. Simple Stockade of Stone and Earth, retained by Wooden Stakes | 20 |
| 7. Stone Stockade, with Inner Core of Masonry | 20 |
| 8. Wooden Palisade of Tree-Trunks, strengthened with Earth | 21 |
| 9. Badbury Rings, Dorset | 23 |
| 10. The Berm of Cadbury Castle | 24 |
| 11. Ravensburgh Castle, Hexton, Herts | 26 |
| 12. Mam Tor, Derbyshire | 28 |
| 13. Hunsbury, Northamptonshire | 30 |
| 14. Yarnbury, Wilts | 31 |
| 15. Melandra, Derbyshire | 35 |
| 16. Section of the City Defences of Verulamium (near St. Albans) | 37 |
| 17. Battlemented Parapet shown in Caedmon's Paraphrase | 41 |
| 18. Battlements shown in Harl. MS. 603 | 41 |
| 19. The Danish Burh at Gannock's Castle, near Tempsford | 44 |
| 20. Pevensey Castle | 46 |
| 21. Clifford's Castle, Northants | 51 |
| 22. Forebuilding of the Keep, Berkeley | 79 |
| 23. Dover Castle | 81 |
| 24. Clun Castle, Salop | 89 |
| 25. Bamborough Castle | 95 |
| 26. Plans of the Keep of Hedingham Castle | 100 |
| 27. Ground Plan of Conisborough Keep | 107 |
| 28. Conisborough | 108 |
| 29. The Ideal Concentric Castle | 115 |
| 30. Machicoulis supporting an Alur | 117 |
| 31. Merlon pierced with Oillet | 124 |
| 32. Caerphilly Castle | 127 |
| 33. Kidwelly Castle, Carmarthenshire | 129 |
| 34. Chepstow Castle | 141 |
| 35. Leeds Castle, Kent | 143 |
| 36. Bartizan | 178 |
| 37. Diagram illustrating the Principle of Construction in Classical Engines; | 192 |
